Rotary pump



(No Model.)

J. MENGE.

ROTARY PUMP.

No. 480,473. Patented Aug. 9, 1892.

awa'r'w saw.

UNITED STATES PATENT OFFICE.

JOSEPH MENGE, OF NEW ORLEANS, LOUISIANA.

ROTARY PU M P.

SPECIFICATION forming part of Letters Patent No. 480,473, dated August9, 1892.

Application filed April 22, 1891.

To all whom it may concern.-

Be it known that I, JOSEPH MENGE, a citizen of the United States,residing at New Orleans, in the parish of Orleans and State ofLouisiana, have invented certain new and useful Improvements in RotaryPumps; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention relates to improvements in rotary pumps; and it consists ofcertain novel features in the construction of the wheels or so-calledrotary pistons used in said pumps, which features will be understoodafter reference to the accompanying drawings.

The same parts are indicated by the same letters.

Figure 1 represents a vertical section of one form of rotary pump,showing my improved wheel in a horizontal position. Fig. 2 represents avertical section of another form of pump, showing my improved wheel in avertical position. Fig. 3 represents a plan View of my improved wheel,showing one side of the disk and one set of blades or vanes. Fig. 4represents a view at right angles to the axis of the wheel, showing twosets of blades, the said sets being on either side of a central disk.For the sake of clearness only four of the twelve blades are shown inthis figure. Fig 5 is a similar view to that described in Fig. 4,butshowingblades on one side of the disk only.

The pump shown in Fig. 1 is that known as the Menge pump, and isdescribed in Letters Patent to me, No. 421,415, dated February 18, 1890;reissued December 29, 1891, No. 11,214.

The pump shown in Fig. 2 is fully described in my application, SerialNo. 392,123, filed May 8, 1891.

P and P are the suction-ports, and Q and Q are the discharge-openings.

W is the wheel, and the flow of wateris indicated by the direction ofthe arrows. The wheel W consists of a disk W and a plurality of bladesB, symmetrically disposed on either or both faces of the said disk.These blades may be cast integral with or otherwise attached to the saiddisk. It will be noted that these blades have no plate or disk on theouter flat edges, but that they are entirely open ax Serial No. 390,028-(No model.)

ially and radially. Moreover, the said blades are situated only in thepart of the wheel having the greatest velocity-that is, near theperiphery. Since thereis no outer disk around which the water would tendto regurgitate if the said disk did not fit closely, it is not necessaryto have the surface of the wheel make a close point with the retainingsuction-box. I usually give the rotating blades a clearance of fromthree-eighths to five-eighths of an inch. This leaving open passagesaxially as well as radially and placing the cutting-blades where they dothe most work, greatly diminish friction and tend to economy in theoperation of the pump. With blades on each side of the said disk, asshown in Fig. 4, the wheel is intended for double or balanced suction.With blades only on one side, as in Fig. 5, it can be used for single orunbalanced suction, or with right and left wheels on the same shaft itcan also be used for double or balanced suction. The blades B are flatprojections on the disk and are preferably bounded by three curvedsurfaces perpendicular to the said disk. These blades are so constructedthat the distance between two consecutive cutting-edges b and b is equalto that between the discharge edges 1) 11 or, in other words, so thatthe discharge area may equal the cutting area.

The plan of the piston may be readily laid down after a simplecalculation: Calling the radius of the exterior circle of the blades Rand that of the interior or cutting circle a" and the numbers of bladesn, then the circumference of the interior or cutting circle should bedivided into a number of open This length, expressed by separating thedischarge-openings, then becomes the length of the exterior curved faceof the blade. The other two curved faces meet in a point, whose positionis dependent upon the pitch of the blades on the interior or cuttingcircle. By having the sum of the cutting-spaces equal to the sum of thedischarge-spaces there is no wedging of water on the cutting area, noris there any drag on the delivery end of the blades. If the space I) bwere greater than b 11 then there would be a choking outflow. If less,there would be a cramped flow from the cutting-edge and a draggingoutflow from the discharging area of the wheel.

After many experiments I am convinced.

that with a given pitch a wheel constructed in the manner herein showngives the greatest discharge of water with the least power applied.

Having thus described my invention, what I claim, and desire to secureby Letters Patent of the United States, is-

1. In a wheel for a rotary pump, the comblnation, with a disk, of aplurality of flat blades open axially and radially mounted near theperiphery and on each side of said disk, the sides of said bladesforming curved channels of practically uniform cross-section,substantially as described.

2. In a wheel for a rotary pump, the combination, with a disk W of aplurality of flat blades B, open axially and bounded by three curvedsurfaces and mounted on the said disk, said blades having the distancebetween the cutting-edges b equal to the distance between thedischarge-edges b and b the sides of said blades forming curved channelsfor the water practically uniform in cross-section, substantially asdescribed.

3. In a wheel for a rotary pump, the combination, with a disk W of aplurality of flat blades B, open axially and bounded by three curvedsurfaces and mounted on each side of the said disk, said blades havingthe distance between the cutting-edges b equal to the distance betweenthe discharge-edges b and b the sides of said blades forming curvedchannels for the water practically uniform in cross-section,substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

JOSEPH MENGE. Witnesses:

T. B. LYND, JNo. J. WARD.

